Board Thread:DMC5 Spoilers/@comment-39313039-20190501062641/@comment-2601:985:382:A840:21E3:20F5:F1E0:7762-20191106014939

It implies he just hooked up with some girl as a teenager. He may have loved her in some capacity, but not as the English dub protrays. The japanese dub eludes that it was just a time of him having some fun so she's not really significant